A new tool is about to be released – named react0r by its creator, Hamzah Akram(@hamzah_akram) which will unlock iPhone 4 baseband 04.11.08. Hamzah tweeted about his achievement few hours ago.
hope this is not fake and we finally have a working unlock for iPhone 4 on 04.11.08 baseband. He uploaded an image as well:

Finally, we may get unlocks for new basebands  4.11.08 very soon. Stay tuned icon smile Unlock for 04.11.08 coming soon   named react0r by Hamzah Akram